What makes a top sports coach? In a BBC World Service series, made in association with The Open University of Britain, we meet some of the world's elite coaches to find out what inspired them to inspire others. Interviewers Ed Harry, Jane Garvey and Peter Bowes discover the tactics the coaches use to bring the best out of the sporting elite and what influences set them apart from each other.

Tennis manager Sven Groeneveld has reached the very top – steering his players to the biggest prize in tennis, the Grand Slam, explains that his experience has helped him become a coaching great.